74726707921 has 2 divisors, whose sum is σ = 74726707922. Its totient is φ = 74726707920.

The previous prime is 74726707919. The next prime is 74726707963. The reversal of 74726707921 is 12970762747.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52940947921 + 21785760000 = 230089^2 + 147600^2 .

It is a cyclic number.

It is not a de Polignac number, because 74726707921 - 2¹ = 74726707919 is a prime.

Together with 74726707919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (74726707621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37363353960 + 37363353961.

It is an arithmetic number, because the mean of its divisors is an integer number (37363353961).

Almost surely, 2^74726707921 is an apocalyptic number.

It is an amenable number.

74726707921 is a deficient number, since it is larger than the sum of its proper divisors (1).

74726707921 is an equidigital number, since it uses as much as digits as its factorization.

74726707921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2074464, while the sum is 52.

The spelling of 74726707921 in words is "seventy-four billion, seven hundred twenty-six million, seven hundred seven thousand, nine hundred twenty-one".